Mitsubishi Montero (2002-2004). Manual — part 875
AUTOMATIC TRANSMISSION DIAGNOSIS
TSB Revision
AUTOMATIC TRANSMISSION DIAGNOSIS
23Ab-41
128
Low-reverse solenoid
valve
Engine: Idling
Transmission range: P
Battery positive voltage
Engine: Idling
Gear range: 2nd gear
6
− 9 V
129
Reduction solenoid
valve
Engine: Idling
Transmission range: P
Battery positive voltage
Engine: Idling
Gear range: 5th gear
6
− 9 V
130
Torque converter clutch
solenoid valve
Engine: Idling
Gear range: 1st gear
Battery positive voltage
131
Ground
Always
1 V or less
134
Shift indicator light: 3rd
Engine: Idling
Gear range: 3rd gear
Battery positive voltage
Engine: Idling
Gear range: Other than 3rd gear
1 V or less
135
Transmission fluid
temperature warning
light
Ignition switch: LOCK(OFF)
→ ON
1 V or less
→ Battery
positive voltage (after
several seconds have
elapsed)
136
Second solenoid valve
Engine: Idling
Gear range: 2nd gear
Battery positive voltage
Engine: Idling
Transmission range: P
6
− 9 V
137
Under drive solenoid
valve
Engine: Idling
Gear range: 1st gear
Battery positive voltage
Engine: Idling
Transmission range: P
6
− 9 V
138
Overdrive solenoid valve Engine: Idling
Gear range: 3rd gear
Battery positive voltage
Engine: Idling
Transmission range: P
6
− 9 V
139
Ground
Always
1 V or less
142
Shift indicator light: 4th
Engine: Idling
Gear range: 4th gear
Battery positive voltage
Engine: Idling
Gear range: Other than 4th gear
1 V or less
TERMINAL
NO.
INSPECTION ITEMS
INSPECTION REQUIREMENT
NORMAL CONDITION
AUTOMATIC TRANSMISSION DIAGNOSIS
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AUTOMATIC TRANSMISSION DIAGNOSIS
23Ab-42
PCM TERMINAL RESISTANCE AND CONTINUITY INSPECTION CHART
M1231109400101
INSPECTION PROCEDURE USING AN OSCILLOSCOPE
M1231109500090
Waveform sample
ACX01978
ACX01978AC
TERMINAL NO. INSPECTION ITEM
NORMAL CONDITION (CHECK CONDITION)
57
− 124
Transmission fluid temperature
sensor
16.7
− 20.5 kΩ [at 0 °C (32 °F)]
7.3
− 8.9 kΩ [at 20 °C (68 °F)]
3.4
− 4.2 kΩ [at 40 °C (104 °F)]
1.9
− 2.2 kΩ [at 60 °C (140 °F)]
1.0
− 1.2 kΩ [at 80 °C (176 °F)]
0.57
− 0.69 kΩ [at 100 °C (212 °F)]
TERMINAL
NO.
INSPECTION ITEM
INSPECTION REQUIREMENT
NORMAL CONDITION
(WAVEFORM SAMPLE)
70
Crankshaft position
sensor
Transmission
range: N
Idling (Vehicle
stopped)
Waveform A
64
Input shaft speed sensor Transmission
range: Sport
mode
Driving at constant
speed of 50 km/h
(31 mph) in 4th
gear (Engine: 1,500
− 2,000 r/min)
Waveform B
73
Output shaft speed
sensor
79
Vehicle speed sensor
Waveform C
128
Low-reverse solenoid
valve
• Ignition
switch: ON
• Transmission
range: P
• Engine:
Stopped
• Throttle
(Accelerator)
opening
angle: Less
than 1 Volt
Force drive each
solenoid valve
(Actuator test)
Waveform D
137
Underdrive solenoid
valve
136
Second solenoid valve
138
Overdrive solenoid valve
129
Reduction solenoid
valve
130
Torque converter clutch
control solenoid valve
AC001872AE
WAVEFORM A
(V)
0
5
(ms)
AC001873AD
WAVEFORM B
(V)
0
5
(ms)
AC001873AE
WAVEFORM C
(V)
0
12
(ms)
AC001875AD
WAVEFORM D
(V)
0
20
(ms)
40
60
TRANSFER DIAGNOSIS <ACTIVE TRAC 4WD II>
TSB Revision
AUTOMATIC TRANSMISSION DIAGNOSIS
23Ab-43
TRANSFER DIAGNOSIS <ACTIVE TRAC 4WD II>
TRANSFER (ACTIVE TRAC 4WD II) DIAGNOSTIC TROUBLESHOOTING STRATEGY
M1231110800040
Use these steps to plan your diagnostic strategy. If
you follow them carefully, you will find most transfer
malfunctions.
1. Gather as much information as possible about the
complaint from the customer.
2. Verify that the condition described by the
customer exists.
3. Check the vehicle for any transfer Diagnostic
Trouble Codes (DTCs).
4. If you can not verify the condition and there are no
DTCs, the malfunction is intermittent. For
information on how to cope with intermittent
malfunctions, refer to GROUP 00, How to Use
Troubleshooting/Inspection Service Points
− How
to Cope with Intermittent Malfunction
.
5. If there is a DTC, record the number of the code,
then erase the code from memory using scan tool
MB991502.
6. If a DTC is set again, go to Inspection Chart for
Diagnostic Trouble Codes.
7. If a DTC is not set again, the malfunction is
intermittent. For information on how to cope with
intermittent malfunctions, refer to GROUP 00,
How to Use Troubleshooting/Inspection Service
Points
− How to Cope with Intermittent
Malfunction
8. After repairs are completed, confirm the
malfunction has been eliminated.
TRANSFER DIAGNOSTIC TROUBLE CODE
DIAGNOSIS
M1231110900047
CHECK CENTER DIFFERENTIAL LOCK
INDICATOR LIGHT
The center differential lock indicator light flashes once per sec-
ond if there is an abnormality in any of the items below which
are related to the transfer system. Check for diagnostic trouble
codes if the center differential lock indicator light is flashing
once per second.
ON-BOARD DIAGNOSTICS
The transfer-ECU monitors its input/output signals
(some signals all the time and others under specified
conditions). When an irregular signal is initially moni-
tored, the transfer-ECU decides that a malfunction
has occurred and records the occurrence as a diag-
nostic trouble code. There are 21 diagnostic items.
The diagnostic results can be read with a scan tool.
Diagnostic trouble codes are kept in memory by
direct battery feed. The codes are retained in mem-
ory even if the ignition switch is in the "LOCK" (OFF)
position. Diagnostic trouble codes will, however, be
erased when a battery terminal or the transfer-ECU
connector is disconnected. In addition, the diagnostic
trouble code can also be erased by scan tool MUT-II
(MB991502).
NOTE: If a sensor is disconnected when the ignition
switch is in the "ON" position a diagnostic trouble
code is stored in memory. In this case, erase the
DTC using scan tool MB991502.
The 21 diagnostic items are displayed in numeric
order.
AC204846AB
TRANSFER DIAGNOSIS <ACTIVE TRAC 4WD II>
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AUTOMATIC TRANSMISSION DIAGNOSIS
23Ab-44
HOW TO READ AND ERASE DIAGNOSTIC
TROUBLE CODES
.
<When using the scan tool>
Required Special Tool:
• MB991502: Scan Tool (MUT-II)
CAUTION
To prevent damage to scan tool MB991502, always turn the
ignition switch to the "LOCK" (OFF) position before con-
necting or disconnecting scan tool MB991502.
NOTE: If the battery positive voltage is low, diagnostic trouble
codes will not be output. Check the battery if the scan tool
MB991502 can not display.
NOTE: If the battery is disconnected or if the transfer-ECU con-
nector is disconnected, the diagnostic trouble codes will be
erased. Do not disconnect the battery or transfer-ECU before
the diagnostic trouble codes have been read.
1. Connect scan tool MB991502 to the data link connector.
2. Turn the ignition switch to the "ON" position.
3. Record the diagnostic trouble codes (DTCs) for transfer.
4. Refer to
, Diagnostic Trouble Code Chart.
5. Turn the ignition switch to the "LOCK" (OFF) and then back
to "ON" again.
6. Erase the diagnostic trouble code by selecting DTC erase
from SPECIAL MENU screen, using scan tool MB991502.
7. Check for diagnostic trouble codes. Confirm the scan tool
displays "normal."
8. Turn the ignition switch to the "LOCK" (OFF) position.
9. Disconnect scan tool MB991502.
.
<When using the differential lock indicator light>
Required Special Tool:
• MB991529: Diagnostic Trouble Code Check Harness
1. Use special tool MB991529 to ground terminal number 1 of
the data link connector.
2. Turn on the ignition switch to the "ON" position.
ACX01539AD
MB991502
16-PIN
1 2 3 4 5 6 7 8
9 10 11 12 13 14 15 16
ACX01772AD
MB991529
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